From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jan Kara Subject: Re: [PATCH 2/3] ext4: introduce ext4_error_remove_page Date: Thu, 25 Oct 2012 21:39:11 +0200 Message-ID: <20121025193911.GD3262@quack.suse.cz> References: <1351177969-893-1-git-send-email-n-horiguchi@ah.jp.nec.com> <1351177969-893-3-git-send-email-n-horiguchi@ah.jp.nec.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Andi Kleen , Tony Luck , Wu Fengguang , Andrew Morton , Jan Kara , Jun'ichi Nomura , Akira Fujita , linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-ext4@vger.kernel.org To: Naoya Horiguchi Return-path: Content-Disposition: inline In-Reply-To: <1351177969-893-3-git-send-email-n-horiguchi@ah.jp.nec.com> Sender: owner-linux-mm@kvack.org List-Id: linux-ext4.vger.kernel.org On Thu 25-10-12 11:12:48, Naoya Horiguchi wrote: > Ext4 has its own configurable error handling policy, so it's helpful > if we can use it also in the context of memory error handling. > With this patch, when we detect a memory error on a dirty pagecache in > ext4 filesystem, we can allow users to choose to trigger kernel panic > to avoid consuming corrupted data. OK, I've checked and memory_failure() function guarantees page->mapping is !NULL. So I'm OK with this patch. You can add: Reviewed-by: Jan Kara Honza > > Signed-off-by: Naoya Horiguchi > --- > fs/ext4/inode.c | 35 +++++++++++++++++++++++++++++++---- > 1 file changed, 31 insertions(+), 4 deletions(-) > > diff --git v3.7-rc2.orig/fs/ext4/inode.c v3.7-rc2/fs/ext4/inode.c > index b3c243b..513badb 100644 > --- v3.7-rc2.orig/fs/ext4/inode.c > +++ v3.7-rc2/fs/ext4/inode.c > @@ -3163,6 +3163,33 @@ static int ext4_journalled_set_page_dirty(struct page *page) > return __set_page_dirty_nobuffers(page); > } > > +static int ext4_error_remove_page(struct address_space *mapping, > + struct page *page) > +{ > + struct inode *inode = mapping->host; > + struct buffer_head *bh, *head; > + ext4_fsblk_t block; > + > + if (!PageDirty(page) || !page_has_buffers(page)) > + goto remove_page; > + > + /* Lost data. Handle as critical fs error. */ > + bh = head = page_buffers(page); > + do { > + if (buffer_dirty(bh) && !buffer_delay(bh)) { > + block = bh->b_blocknr; > + EXT4_ERROR_INODE_BLOCK(inode, block, > + "Removing dirty pagecache page"); > + } else > + EXT4_ERROR_INODE(inode, > + "Removing dirty pagecache page"); > + bh = bh->b_this_page; > + } while (bh != head); > + > +remove_page: > + return generic_error_remove_page(mapping, page); > +} > + > static const struct address_space_operations ext4_ordered_aops = { > .readpage = ext4_readpage, > .readpages = ext4_readpages, > @@ -3175,7 +3202,7 @@ static const struct address_space_operations ext4_ordered_aops = { > .direct_IO = ext4_direct_IO, > .migratepage = buffer_migrate_page, > .is_partially_uptodate = block_is_partially_uptodate, > - .error_remove_page = generic_error_remove_page, > + .error_remove_page = ext4_error_remove_page, > }; > > static const struct address_space_operations ext4_writeback_aops = { > @@ -3190,7 +3217,7 @@ static const struct address_space_operations ext4_writeback_aops = { > .direct_IO = ext4_direct_IO, > .migratepage = buffer_migrate_page, > .is_partially_uptodate = block_is_partially_uptodate, > - .error_remove_page = generic_error_remove_page, > + .error_remove_page = ext4_error_remove_page, > }; > > static const struct address_space_operations ext4_journalled_aops = { > @@ -3205,7 +3232,7 @@ static const struct address_space_operations ext4_journalled_aops = { > .releasepage = ext4_releasepage, > .direct_IO = ext4_direct_IO, > .is_partially_uptodate = block_is_partially_uptodate, > - .error_remove_page = generic_error_remove_page, > + .error_remove_page = ext4_error_remove_page, > }; > > static const struct address_space_operations ext4_da_aops = { > @@ -3221,7 +3248,7 @@ static const struct address_space_operations ext4_da_aops = { > .direct_IO = ext4_direct_IO, > .migratepage = buffer_migrate_page, > .is_partially_uptodate = block_is_partially_uptodate, > - .error_remove_page = generic_error_remove_page, > + .error_remove_page = ext4_error_remove_page, > }; > > void ext4_set_aops(struct inode *inode) > -- > 1.7.11.7 > -- Jan Kara SUSE Labs, CR -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org